Résistance a la dessiccation de Biomphalaria glabrata adultes infestés par plusieurs miracidiums de Schistosoma mansoni

Memórias do Instituto Oswaldo Cruz

F. Lancastre²  M. Vianey-liaud¹  G. Coutris¹  J. Bolognini-treney²  G. Mougeot²  J. P. Ouaghlissi² 

[1] ,Faculté de Médecine Sait-Antoine Laboratoire de Parasitologie, Pathologie et Epidémiologie parasitaires Paris,France

关键词: Biomphalaria glabrata;    Schistosoma mansoni;    miracidial polyinfection;    desiccation;    carcarial sheddings;    periodic variations;    Biomphalaria glabrata;    Schistosoma mansoni;    pluriinfestation;    dessiccation ou anhydrobiose;    émissions des cercaires;    variation périodiques;   

DOI  :  10.1590/S0074-02761989000200008

来源: SciELO

【 摘 要 】

1200 adult Biomphalaria glabrata were submitted during 6 weeks to anhydrobiosis condition. Some snails were healthy, some were previously infected 3 days or 12 days ago with 8 ± 2 miracidia of Schistosoma mansoni, others were shedding cercariae. The snails were put on soil or buried into hermetically closed, or ventilated, plastic boxes. There was no survival of snails kept in sealed boxes, or among positive snails, but 44% of control health snails and 40,6% of infected (for 3 or 12 days) snails in ventilated boxes were living at the term of the desiccation stage. Survival was better for "on soil" snails than for "buried" snails, but difference was shown between 3-days and 12-days infection. The surving desiccated B. glabrata had a lesser death rate and a lesser cercarial production than infected snails kept in water. An inferior production of male cercariae comparatively to female and to "mixed" cercariae was demonstrated by statistical analysis of the cercarial sheddings. In all positive snails, periodic variations of cercarial production was shown, whatever the sex of those cercariae. In addition many pauses of the sheddings were established by the authors.

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